CVE-2023-33186

Zulip is an open-source team collaboration tool with unique topic-based threading that combines the best of email and chat to make remote work productive and delightful. The main development branch of Zulip Server from May 2, 2023 and later, including beta versions 7.0-beta1 and 7.0-beta2, is...

CVE-2021-43799

Zulip is an open-source team collaboration tool. Zulip Server installs RabbitMQ for internal message passing. In versions of Zulip Server prior to 4.9, the initial installation until first reboot, or restart of RabbitMQ does not successfully limit the default ports which RabbitMQ opens; this...

CVE-2021-30479

An issue was discovered in Zulip Server before 3.4. A bug in the implementation of the allpublicstreams API feature resulted in guest users being able to receive message traffic to public streams that should have been only accessible to members of the organization...

CVE-2021-30487

In the topic moving API in Zulip Server 3.x before 3.4, organization administrators were able to move messages to streams in other organizations hosted by the same Zulip installation...

CVE-2021-30478

An issue was discovered in Zulip Server before 3.4. A bug in the implementation of the canforgesender permission previously isapisuperuser resulted in users with this permission being able to send messages appearing as if sent by a system bot, including to other organizations hosted by the same...

CVE-2021-30477

An issue was discovered in Zulip Server before 3.4. A bug in the implementation of replies to messages sent by outgoing webhooks to private streams meant that an outgoing webhook bot could be used to send messages to private streams that the user was not intended to be able to send messages to...

CVE-2020-9444

Zulip Server before 2.1.3 allows reverse tabnabbing via the Markdown functionality...

CVE-2020-15070

Zulip Server 2.x before 2.1.7 allows eval injection if a privileged attacker were able to write directly to the postgres database, and chose to write a crafted custom profile field value...

CVE-2020-14215

Zulip Server before 2.1.5 has Incorrect Access Control because 0198preregistrationuserinvitedas adds the administrator role to invitations...

CVE-2020-14194

Zulip Server before 2.1.5 allows reverse tabnapping via a topic header link...

CVE-2020-9445

Zulip Server before 2.1.3 allows XSS via the modallink feature in the Markdown functionality...

CVE-2019-19775

The image thumbnailing handler in Zulip Server versions 1.9.0 to before 2.0.8 allowed an open redirect that was visible to logged-in users...

CVE-2019-16215

The Markdown parser in Zulip server before 2.0.5 used a regular expression vulnerable to exponential backtracking. A user who is logged into the server could send a crafted message causing the server to spend an effectively arbitrary amount of CPU time and stall the processing of future messages...

CVE-2025-47930 Zulip Server has access control bypass for restrictions on creation of specific channel types

Zulip is an open-source team chat application. Starting in version 10.0 and prior to version 10.3, the "Who can create public channels" access control mechanism can be circumvented by creating a private or web-public channel, and then changing the channel privacy to public. A similar technique...

CVE-2025-47930 Zulip Server has access control bypass for restrictions on creation of specific channel types

Zulip is an open-source team chat application. Starting in version 10.0 and prior to version 10.3, the "Who can create public channels" access control mechanism can be circumvented by creating a private or web-public channel, and then changing the channel privacy to public. A similar technique...

CVE-2025-47930

Zulip Server vulnerability CVE-2025-47930 affects versions 10.0–10.2, where the access control for creating certain channel types can be bypassed by creating a private or web-public channel and then changing its privacy to public (and a similar method to create private channels without permission...

CVE-2025-27149

Zulip server provides an open-source team chat that helps teams stay productive and focused. Prior to 10.0, the data export to organization administrators feature in Zulip leaks private data. The collection of user-agent types identifying specific integrations or HTTP libraries E.g.,...

CVE-2024-27286

Zulip is an open-source team collaboration tool. When a user moves a Zulip message, they have the option to move all messages in the topic, move only subsequent messages as well, or move just a single message. If the user chose to just move one message, and was moving it from a public stream to a...

CVE-2025-30369 Zulip allows the deletion of Custom profile fields by administrators of a different organization

Zulip is an open-source team collaboration tool. The API for deleting an organization custom profile field is supposed to be restricted to organization administrators, but its handler failed to check that the field belongs to the same organization as the user. Therefore, an administrator of any...

CVE-2025-30369 Zulip allows the deletion of Custom profile fields by administrators of a different organization

Zulip is an open-source team collaboration tool. The API for deleting an organization custom profile field is supposed to be restricted to organization administrators, but its handler failed to check that the field belongs to the same organization as the user. Therefore, an administrator of any...